Cutting chain pin and lock



June 26, 1951 c. J. FORBES CUTTING CHAIN PIN .AND LOCK Filed Feb. 20, 1947 3 M 2/ V M H 0 f TR N 5 7 NE W H W. 0 0 M 7 WJ U B Mi l M 1 W 5 f /2 E .1 I ML 4 L Patented June 26, 1951 UNITED STATES PATENT OFFICE 1 Claim.

This invention relates to machinery suitable for the cutting of coal and the like.

The invention is primarily directed to the pivotal connection between links of a cutting chain having cutters or bits supported by certain of the links.

The chief object of the present invention is to lock the pin means to one of a pair of adjacent links or link means so that relative rotation of the pin means and said one link or link means is prevented and the adjacent links are pivotally secured together and the pin means is locked against axial separation.

The chief feature of the present invention resides in forming one end of a tubular barrel or pin with a flat face or fiat faces to mate with a corresponding face or faces upon the link to which the pin is to be secured and secure such tubular barrel to that link by a headed stem having the headless end deformable to rigidly secure the barrel and stem together, the barrel and/or stem having a laterally enlarged portion or portions nestable in a link recess or recesses, respectively. 7

Other objects and features of the invention will be set forth more fully hereinafter.

The full nature of the invention will be understood from the accompanying drawings and the following description and claim.

In the drawings- Fig. 1 is a side elevation of a pair of pivotally connected links one being of straddle type, and the pivotal connection therebetween.

Fig. 2 is a central sectional view through the same.

Fig. 3 is a perspective view of the barrel and headed stem in disassembled position.

Fig. 4 is a view similar to Fig. 1 of a second embodiment of the invention, the view being taken from the same side but of the other end of a corresponding link.

Fig. 5 is a central sectional view, similar to Fig. 2 and of the form of the invention shown in Fig. 4.

Fig. 6 is a perspective view of the barrel and headed stem shown in Figs. 4 and 5 and in disassembled position.

In Figs. 1 to 3 of the drawings there is illustrated one embodiment of the invention while Figs. 4 to 6 illustrate another. In Figs. 1 and 2, l0 indicates a connecting link having at opposite ends the bores for barrel reception. l I indicates such a bore.

In Fig. 1, [2 indicates the connecting portion connected to spaced portions 13 and H, see Fig. 2, of a straddle type link which includes a support, not shown, in turn supporting a bit ora 2 detachable holder and bit, as well known in the cutter chain art.

At opposite ends said straddle link is provided with aligned bores in portions 13 and M. In Fig. 2 plate [3 includes a cylindrical bore I5 counterbored externally as at Hi Portion It has aligned bore l6 shouldered as at w Herein shoulders 16 are parallel. Bore I6 is externally counterbored at H.

The cylindrical barrel [8 includes central bore l9 therethrough, counterbored at one end as at 26 and at the opposite end at 21. The former end is conically flanged at 22 which is seatable in counterbore of the link portion I3. The barrel opposite the flanged end is shouldered as at 23 and providing parallel flat faces 24.

The headed stem comprises cylindrical portion 25 with conical enlargement 26 and head 21 conically edged as at 28.

The method of assembly is as follows: The two links are lapped as shown in Fig. 2 and barrel I8 presented shouldered end first to bore I5 and rotated if necessary to register faces 25 with faces l6 When fully seated flange 22 seats in counterbore or recess l5 thus limiting inward or longitudinal movement of the barrel.

If flange 22 were omitted shoulders 23 could be disposed more forwardly and then engage the inside face of portion Hi and effect functionally the same result.

When prperly seated the stem is presented free end first to the faced end of the barrel. When fully seated, portion 26 seats in barrel counterbore 2i and flange edge 28 seats in counterbore ll of link portion 54. The stem then projects beyond the barrel as shown by dotted lines 30 in Fig. 2. When so seated that end is enlarged as shown at 29 in said figure thus filling counterbore 25 and locking the parts together.

Hence axial displacement of the barrel in the several link aligned bores is prevented and rotation relative to the straddle link is also prevented and the links in effect are riveted together in pivotally connected relation.

Reference will now be had to Figs. 4 to 6 inclusive where a modified form of the invention is illustrated. Herein the stem is T-shaped and the tubular pin barrel omits the flange at the end opposite the shoulders and faces.

In this embodiment, see Fig. 6, E25 indicates the stern and E2! the head or cross-piece. The cylindrical tubular barrel M3 includes central bore Hi3 and shoulders HS and adjacent faces I24 at one end. At this end also, and transverse to faces [2i is and groove 53 l.

Link portion HQ has bore lit with flat, substantially parallel faces H6 and a transversely disposed groove I [1. Same registers with barrel groove I3! when barrel shoulders I23 engage against the inside face of link portion I I4.

Link II includes cylindrical barrel receiving bore III. The opposite link portion I33 has cylindrical bore H5. The barrel H8 opposite the grooved end includes counterbore I29.

Barrel I I8 is registered slotted end first through bore H and bore II I until the shoulder engagement described is effected. Then the stem is applied to the barrel bore and passed reversely therein until head I21 seats in barrel groove I3I and the projecting ends seat in link recess or groove III. This prevents stem passage through the links.

The projecting end I30, see dotted lines in Fig. 5, is then deformed as at I29 to seat in barrel counterbore I20. In this manner, as before, the barrel and stem are oppositely presented to the lapped links and the final looking as by enlargements 29 and I29 is effected at the side from whence initial barrel presentation is eifected.

Whenever release is required, enlargement 329 or I29 is removed from the stem and later driven out of the barrel toward the head of the stem. Also the barrel may then be reversely withdrawn from the links, the link substitution effected, the barrel replaced and a replacement headed stem applied as before.

While the invention has been illustrated and described in great detail in the drawings and foregoing description, the same is to be considered as illustrative and not restrictive in character.

The several modifications described herein as well as others which will readily suggest themselves to persons skilled in this art, all are considered to be within the broad scope of the invention, reference being had to the appended claim.

The invention claimed is:

A cutter chain structure comprising, in combination, a center link and a pair of overlapping side links, said links having registering bores therein, each of said side links having a conical bore in its outer face, a connecting barrel seated in the registering bores having at one end a conical head seated in a conical bore in the outer face of one of said side links with its top lying flush with the outer face of the link, the bore of the opposed side link having a flattened side adapted to cooperate with a flattened shoulder of the link barrel, said barrel being such that its opposite end is flush with the bottom of the counterbore of the second side link, one end of said barrel having a counterbore below the outer face thereof, and a headed locking pin extending through said links and barrel having an enlarged head seated in the counterbore in the second mentioned side link and lying flush with the outer face of the link, and having its opp0- site end headed into a counterbore of said barrel and lying flush with the outer end of said barrel.

CHARLES J. FORBES.

REFERENCES CITED The following references are of record in the file of this patent UNITED STATES PATENTS Number Name Date 1,464,267 Harrison Aug. 7, 1923 2,012,947 Bosnian Sept. 3, 1935 2,365,911 Simmons Dec. 26, 19 14 FOREIGN PATENTS Number Country Date 24,232 Great Britain 1898 439,190 Germany Jan. 5, 1927 

